Reply to Ordinary day of a mix?

Hi, I'm new to DJ'ing and would like to ask you guys about preparing songs, samples and everything else that I dont know about it yet. What story you get while search for tracks and believeing of being creative? How long it takes you to make a mix you want it, what goes after...? I got loads of ideas about using samples in the mix and adding something extra, buying a midi keyboard, getting a loop controller, mastering my mixer and so on... but I am curious to know what advanced DJ's are doing to create something.